Growing under leylandii
Hello, apologies if this has been asked before. We have a narrow south facing border which is overhung by tall leylandii in a neighbour's garden (to be fair the the neighbours they are very good about keeping them trimmed but we can't cut them back too far without killing the growth and being left with bare sticks to look at). The bed is in bright sun during the morning but deep shade from another tree in the afternoon. The leylandii make the soil really dry and to my surprise, given the number of needles and twigs they drop, it tests as alkaline. Salvias, larkspur and toadflax manage okay but a lot of other things really struggle. Can anyone please suggest plants that would be happy in these conditions? I've ordered some grasses and am thinking of dahlias and calendulas but I don't want to waste plants that will just shrivel up or sulk. Thank you!